Annals of the International Geophysical Year, Volume 33: Results of Ionospheric Drift Observations describes the systematic changes in individual ionospheric observations during the International Geophysical Year (IGY). This book is composed of four chapters, and begins with a presentation of the general data on stations and the lists of publications concerning drift work during IGY/IGC. The next chapter contains the results obtained mainly by intercomparison of the time shift between fadings observed on three antenna separated by a distance of roughly a wavelength. These data are followed by a discussion of the results for a station, which has made the big effort of applying the correlation analysis as a routine. The concluding chapter highlights further results of intercomparison observations and tests, and a few stations'' results obtained with drift meteor trails determined by combinations of Radar- and Doppler-techniques, as well as the intercomparison of fieldstrength fluctuations of cosmic radio waves. This book is of great value to geophysicists and space scientists and researchers.